New Hampshire tourism officials are estimating they will see about 13.6 million out-of-state visitors this summer who will spend about $1.9 billion. The Institute for New Hampshire Studies said that represents about a 1 percent increase in population and 2 percent increase in spending from last year. The state Division of Travel and Tourism Development said summer accounts for 40 percent of visitation and spending to New Hampshire. Most of the visitors for the summer will be from New England, the Middle Atlantic states, and eastern Canada.